Smart meter installed as Economy 10 - how will this affect my cylinder water supply?

Yep, sorry about that. I spend a lot of mental energy converting am/pm times to the 24-hour clock to avoid the confusion that always arises otherwise, and somehow ended up with your 5pm inside the 13:30-16:30 slot, which of course it isn’t 😳

The overlap between your tariff timings and what may be your switching times mean that the only tell-tale you can reasonably capture is at about 00:15 (quarter past midnight!) when the tariff should be peak, set to change to offpeak at 04:39. The red light at the booster box shouldn’t be on, and if you can find your way to the meter, the little icons in the corner of the screen should look just like they do in your earlier screenshot (you can press button A to light up the screen):
  

So, no red light, and no different switch icons on the meter display means things are set up just as they should be. Red light and different icons mean trouble, so be sure to come back and tell us what you found. 

The next hurdle to be cleared is to find out why the water tank didn’t heat up between 13:30 and 16:30 yesterday. At least you can use the boost box during those hours if necessary.

PS I don’t think you ever did reveal where you are in the country. I’ve been assuming from the various clues you’ve left that you are in fact in the Scottish Hydro region (north of the Firth of Clyde). I’m sure I mentioned that this is vital information in so many respects.

​@Firedog as ever thankyou again. All makes sense. The last time i was at the meter the symbols and light etc were just as they are. Latif checked the wiring and box today kindly, battling the suspended ferry service and drove the extra round by road from Glasgow back to Dunoon in Argyll, or Cowal if you like. So it all seems set up correct, tomorrow night I'll be doing the graveyard shift to investigate a bit more the 00.30 finish and the 04.30 off peak start and will see if can figure out the immersion. Latif wasn't sure why it would take 6 weeks for OVO to divulge the tariff details, and to make sure that it was definitely charging during those 3 off peak sections etc, said he would make some enquiries himself. If not a bother i will keep you guys updated, as it is more than helpful believe me, realise we all struggle with energy bills etc, and considering we aren't on any radar for grants etc for solar, pumps etc, 8 years ago we were quoted 12,000 just to get mains gas connecting. A few folk round here rely on oil heating and heat recovery/stoves etc.

Thanks. I hope Latif was suitably rewarded for what is obviously service above and beyond the call of duty. 

At 00:30 (actually, probably nearer 00:40) you should see the tariff change on your IHD.  What I’m hoping you won’t find is that the heaters come on at 00:10 and the little bottom icon on the meter changes from its open state (o´o) to something else. 
 

That’s a magical part of the world you live in - thanks for telling us. 

So on checking the meter box at 6.15am, is in off peak mode, guessing the icons look a wee bit different as hopefully can see on the picture. I'll recheck at 7.45 ish when will have switched to peak mode. The red light was flashing on the meter box at this time too, slow intermittent. The IHD shows an orange middle light, and the next tariff change countdown is correct and showing. Will update after 7.45 see if the icons have switched...

Update at 7.45am, tariff has changed to peak, the symbols have switched back to what you said ​@Firedog , the red light flashes every 15 seconds or so from what i can tell on the meter. IHD looks ok. 

Thanks, but …

We’re not really any further forward. All we know from these observations is that the heating circuit was active at 06:15 but not at 07:45, clearly established by the load control icons and the fact that at least one heating element was busily drawing something over 3.3kW at 06:49. That could have been the water immersion heater or a storage heater.

Sadly, this would have been the case whether the load control switch was configured correctly or not. The real clincher will be after midnight as I suggested, and I’m expecting you find that the tariff shown on the IHD changes at 00:40. What I hope you won’t find that at that time is the heaters charging up and the load control switches showing LC1 LC2 like they did early this morning.

The red light flashing on the meter is its impulse counter. It flashes faster when there’s a bigger current passing through the meter, so this is what you’d expect to see when the load is 3.57 kW as your IHD was showing. It will do the same when you boil the kettle or make toast. At other times when not much is happening, the IHD will show a much smaller power draw (in Watts if it’s less than 1000, otherwise in kW), and you’d get bored waiting for the red light to flash. 

Flashing at 15-second intervals is 4 impulses per minute, or 240 per hour. That means that the instantaneous load when you were watching was 240W, quite reasonable if there are a few things running like fridge, freezer, lights and so on. 

That makes sense ​@Firedog I'll have a meter stakeout tonight to have a look at the IHD and the meter itself. Ovo still say they don't know anything til roughly 6 weeks etc, so Latif the engineer kindly messaged what he thought our area's timings were and the set up was for. I'm still not sure if the immersion kicks in on the 2 other off peaks but will look tonight.

20.50 when should be in off peak mode, these symbols are on, tariff correct on IHD and the display on the meter itself. I thought this should show the other symbol during off peak guys? Again, will look at 00.40ish etc too.

Amd it's certainly not heating the cylinder/water on the PM and evening slots, enough hot water for a bath this evening, no other hot water used today.